Thiefproof-lamp construction



1520350 R. S. IREMONGER THIEFPROOF LAMP CONSTRUCTION Filed Jan. 5, 19222 Sheets-Sheet 1 R. 3. HREMONGER THIEFPROOF LAMP CONSTRUCTION Filed Jan.5, 1922 2 Sheets-Sheet 2 Patented Dec. 23, 1924.

UNITED STATES PATENT OFFICE.

ROBERT S. IRElVIONG-ER, 0F NEI/V YORK, N. Y., ASSIGNOR TO BENJAMINELECTRIC MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

'II-IIEFPROOF-LAMP CONSTRUCTION.

Application filed January 3, 1922.

To all whom it may concern.

Be it known that I, ROBERT S. IREMONGER, a citizen of the United States,residing at New York city, in the county of New York and State of NewYork, have invented new and useful Improvements in Thiefproof- LampConstructions, of which the following is a full, clear, concise, andexact description, reference being had to the accompanying drawing,forming a part of this specification.

My invention relates to thlef-proof lamp construction.

One of the objects of my inventlon is to provide an improvedconstruction which will make it difficult for anyone to steal the globewhich encloses an electric lamp.

Further objects will appear from the detailed description to follow andfrom the ap pended claim.

In the drawings in which an embodiment of my invention is shown Figure 1is a plan view of a caslng and a lamp enclosing globe supported thereby;

Fig. 2 is a section on the l1ne 2-2 of Fig. 1;

Fig. 3 is an enlarged sectional view of the pawl and key;

Fig. 1 is a plan view of the globe;

Fig. 5 is a side elevation of the top of the globe; and

Fig. 6 is a section on the hne 66 of Fig. 3.

Referring now to the drawings 1n detail, the construction shown thereincomprises a lamp socket 10, mounted on a suitable support 11, a metalc'asing 12, mounted in front of the support 11, a lamp 13 screwed intothe socket 10, a globe 14L screwed into the easing 12, and enclosinglamp 13, and a thiefproof construction 15 for preventing an unauthorizedperson from unscrewing the globe and stealing it and the lamp.

The thief-proof constructlon comprises a spring-pressed pawl 16, thepoint of which bears against the threads 17 (Figs. 4: and 5) on theglobe 14:, these threads being cut away in several places as indicatedat 18 to provide a sort of ratchet. construction for Serial No. 526,768.

cooperation with the pawl 16, which will permit the globe 14 to bescrewed into the casing, but will prevent it from being unscrewed by theengagement of the pawl in these notches 18.

The suitable frame 19, which may be a sheetmetal stamping, the stampingfor this purpose being provided with alined bearing openings 20, toreceive the pintles 21 of the pawl. The pawl itself may also be asheetmetal stamping. The lower pintle 21 has a sort of wrench engagementwith a screwthreaded key-engaging socket 22, as shown 1n Figs. 3 and 6,this key-engaging socket having its upper end extending into the loweropening in the frame 19, and having ts lower end mounted in asheet-metal bearing cap 23, secured in an opening 24L in the casing 12.

For holding the point of the pawl pressed against the threads 17 on theglobe, a coil torsion spring 25 is provided which surrounds thekey-engaging socket 22. One end of this spring engages a lug 26 on thepawl 16, and the other end is suitably secured to some fixed part.

For operating the pawl, to release it from its engagement with theratchet teeth 18, a key 27 is provided having a handle portion 28, and athreaded shank 29 which screws into the screw-threaded socket 22,andwhich when it is screwed home makes it possible to turn the pawl 16 byme'ans of the key. This thread on the key is made left-handed, so thatthe pawl cannot be operated by means of an ordinary right-hand threadscrew.

It will be seen that I have provided a simple construction which willprevent the removal of the globe and the enclosed lamp by anunauthorized person.

WVhile I have shown but one embodiment of my invention, it is obviousthat it may be embodied in other forms covered and defined by theappended claim.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent of the United States is:

The combination with a lamp socket and pawl 16 is pivotally mounted in aE an internally threaded easing adjacent said socket, of a globe forenclosing a lamp bulb having a helical thread formed integral therewithfor engaging the thre'aded casing, said helical thread having aplurality of turns, the turns of said threads having a series of alinednotches therein, and a pawl pivoted about an 'axis parallel to the axisof the socket and having a broad edge for engaging said series of alinednotches. 10

In witness whereof, I have hereunto subscribed my name.

ROBERTS. IREMONGER.

